Add image_picker library, refs #10046

Reason: before this commit app crashs in release mode,
there are no settings for this app (in ios settings app).

After adding image_picker library and getImage() function in
lib/common.dart (pre caution against AOT compiller dead code
elemenation) after ask permissions for camera usage.

lib/common.dart

@@ -4,6 +4,7 @@ import 'package:checker/screens/settings.dart';
 import 'package:checker/screens/splash.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+import 'package:image_picker/image_picker.dart';
 import 'package:intl/intl.dart';
 
 import 'db.dart';
@@ -213,3 +214,8 @@ getLocaleTitle(String code) {
       return 'Español';
   }
 }
+
+// Добавил вызов, что-бы AOT компилер не выкинул либу.
+getImage() {
+    return await ImagePicker.pickImage();
+}